Fixes are available
APAR status
Closed as program error.
Error description
The compiler produces an internal compiler error when compiling the following testcase that has inline asm memory operands and the -O compile time option: =====Testcase: $cat test.cpp inline static void add_atomic(unsigned long volatile *sum, unsigned long inc) { unsigned long oldval; unsigned long newval; unsigned long zero = 0; asm( " lwsync \n\t" "1: ldarx %[ov],0,%[sum],0 \n\t" // get old ctr and reserve " add %[nv],%[ov],%[inc] \n\t" // increment " stdcx. %[nv],0,%[sum] \n\t" // store updated value " bne 1b \n\t" // reservation lost? -> retry " isync \n\t" : [sum] "+b" (sum) /* outputs */ , [ov] "=&b" (oldval) /* outputs */ , [nv] "=&b" (newval) /* outputs */ : [inc] "b" (inc) /* inputs */ : "cr0" /* clobbered */ ); } int main() { static unsigned long tm[20]; add_atomic(&tm[0], 0); } $ ===== ACTUAL OUTPUT: $xlc_r -q64 -o testcase -O testcase.cpp /usr/vacpp/bin/.orig/xlc_r: 1501-230 (S) Internal compiler error; please contact your Service Representative. For more information visit: http://www.ibm.com/support/docview.wss?uid=swg21110810 $ ===== EXPECTED OUTPUT: Should not ICE at -O2 or above.
Local fix
n/a
Problem summary
USERS AFFECTED: Users that have applications that make use of inline functions which have inline asm code using pointer as output operand, and replaces with the address of an array at opt may be affected by this issue. PROBLEM DESCRIPTION: The compiler issues an internal compiler error when users compile applications that have inline functions which have inline asm code using pointer as output operand.
Problem conclusion
The compiler has been fixed so it will not replace the asm output opernd with the new optimized expression if it is a pointer.
Temporary fix
Comments
APAR Information
APAR number
LI76916
Reported component name
XL C/C++ RHEL52
Reported component ID
5724U8310
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-07-16
Closed date
2012-07-16
Last modified date
2012-07-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XL C/C++ RHEL52
Fixed component ID
5724U8310
Applicable component levels
RA10 PSN IV18039
UP06/09/13
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSJT9L","label":"XL C\/C++"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"A.1","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
16 October 2021